The inclined beam detachable assembled grandstand is a new type of temporary grandstand system. The overall structure adopts standard components and modular design. Various components of the grandstand, such as brackets, pedals, side panels, guardrails, seats, etc., can be freely assembled and combined according to the needs of the venue and audience seats, with various heights and positions of assembly. It has the characteristics of simple structure, easy construction and disassembly, convenient transportation and storage, and can be widely used in sports venues, performing arts activities, various public events and other places where temporary spectator stands need to be built.